Add single-flight coalescing for operation compiler

[michaelstaib]

No description provided.

[github-actions]

Fusion Gateway Performance Results

Simple Composite Query

	Req/s	Err%
Constant (50 VUs)	2840.16	0.00%
Ramping (0-500-0 VUs)	3369.03	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	0.75ms	15.61ms	17.38ms	30.96ms	36.38ms	172.04ms
Ramping	0.72ms	64.58ms	66.00ms	123.65ms	139.32ms	257.19ms

query TestQuery {
  topProducts(first: 5) {
    inStock
    name
    price
    shippingEstimate
    upc
    weight
    reviews {
      id
      body
      author {
        id
        username
        name
      }
    }
  }
}

---

Deep Recursion Query

	Req/s	Err%
Constant (50 VUs)	746.36	0.00%
Ramping (0-500-0 VUs)	824.97	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	9.28ms	62.19ms	65.45ms	81.30ms	90.24ms	341.31ms
Ramping	1.76ms	252.79ms	260.65ms	522.75ms	560.49ms	674.23ms

query TestQuery {
  users {
    id
    username
    name
    reviews {
      id
      body
      product {
        inStock
        name
        price
        shippingEstimate
        upc
        weight
        reviews {
          id
          body
          author {
            id
            username
            name
            reviews {
              id
              body
              product {
                inStock
                name
                price
                shippingEstimate
                upc
                weight
              }
            }
          }
        }
      }
    }
  }
  topProducts(first: 5) {
    inStock
    name
    price
    shippingEstimate
    upc
    weight
    reviews {
      id
      body
      author {
        id
        username
        name
        reviews {
          id
          body
          product {
            inStock
            name
            price
            shippingEstimate
            upc
            weight
          }
        }
      }
    }
  }
}

---

Variable Batching Throughput

	Req/s	Err%
Constant (50 VUs)	23575.70	0.00%
Ramping (0-500-0 VUs)	18368.60	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	0.10ms	1.71ms	2.07ms	3.94ms	4.81ms	55.73ms
Ramping	0.10ms	9.55ms	11.53ms	23.57ms	28.47ms	108.84ms

query TestQuery($upc: ID!, $price: Long!, $weight: Long!) {
  productByUpc(upc: $upc) {
    inStock
    shippingEstimate(weight: $weight, price: $price)
  }
}

Variables (5 sets batched per request)

[
  { "upc": "1", "price": 899, "weight": 100 },
  { "upc": "2", "price": 1299, "weight": 1000 },
  { "upc": "3", "price": 15, "weight": 20 },
  { "upc": "4", "price": 499, "weight": 100 },
  { "upc": "5", "price": 1299, "weight": 1000 }
]

---

Run 22191673324 • Commit 3449068 • Thu, 19 Feb 2026 18:10:27 GMT

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (346baaa) to head (0f934cd).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #9153   +/-   ##
============================
============================

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